Fast Thermoresponsive Optical Membrane Using Hydrogels Embedded in Macroporous Silicon

• Published in: IEEE sensors letters Vol. 2; no. 2; pp. 1 - 4
• Main Authors: Seo, Sang-Woo, Enemuo, Amarachukwu N., Azmand, Hojjat Rostami
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.06.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acrylamide; Actuators; Copolymerization; hydrogel-based sensors and actuators; Hydrogels; Isopropylacrylamide; macroporous silicon; Optical device fabrication; optical sensor; Optical sensors; Physical arrangement; Response time; Sensor phenomena; Silicon; Temperature measurement; temperature sensor; Temperature sensors; Thermal response; Time factors; Macroporous Silicon; Optical sensor; Temperature Sensor; Hydrogel-based sensors and actuators
• ISSN: 2475-1472; 2475-1472
• DOI: 10.1109/LSENS.2018.2832006

We have fabricated a temperature-sensitive hydrogel through copolymerization of N-isopropylacrylamide and acrylamide inside a macroporous silicon structure and demonstrated fast thermal response compared to its bulk structure. The presented method allows physical arrangement of microsized hydrogels within a predefined arrayed structure. Static and dynamic temperature responses of the fabricated structure are successfully demonstrated through optical transmission measurement. The measured temporal response reveals that the presented structure can allow fast response time of the implemented hydrogels. Furthermore, a spatial thermo-distribution pattern can be observed through pixel-like, arrayed macropores, which indicates a potential for addressing individual or single-channel hydrogel sensors or actuators through temperature stimulation.